Physics Nuclear Physics BUMHS 2022
PMDC Verified Question 42 of 98
When a radioactive nucleus emits a gamma radiation than the mass number of atom is
A
Remain same
B
Increased by a factor 2
C
Decreased by a factor 1
D
Increased by a factor 1
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Remain same


Concept:

Gamma (\(\gamma\)) radiation consists purely of electromagnetic waves (photons) emitted from an excited nucleus.

Solution:

  • Photons possess zero rest mass and zero electrical charge.


  • When a nucleus sheds excess energy by firing a gamma ray, no protons or neutrons are added or removed from the nucleus.


  • Consequently, the mass number (\(A\)) and the atomic number (\(Z\)) remain exactly the same. The element does not transmute.


Why other options are incorrect:

Alpha and beta decays alter mass/charge numbers. Gamma decay is purely an energy transition, never altering mass or charge.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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